REVENUE RECOGNITION - Impact of Adoption on Income Statement (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Gross revenues	$ 56,268	$ 65,218
Less promotional allowances		(11,804)
Net revenues	56,268	53,414
Operating expenses:
Selling, general and administrative	15,185	14,639
Depreciation and amortization	3,692	3,906
Total operating expenses	47,711	45,688
Net income	$ 6,741	$ 4,872
Earnings per share of common stock
Basic (in dollars per share)	$ 0.38	$ 0.28
Diluted (in dollars per share)	$ 0.36	$ 0.27
Casino
Revenues:
Gross revenues	$ 29,945	$ 41,310
Operating expenses:
Operating expenses	10,696	17,680
Food and beverage
Revenues:
Gross revenues	16,938	15,490
Operating expenses:
Operating expenses	13,094	6,252
Hotel
Revenues:
Gross revenues	6,363	5,640
Operating expenses:
Operating expenses	3,499	2,208
Other
Revenues:
Gross revenues	3,022	2,778
Operating expenses:
Operating expenses	1,545	$ 985
ASC 606 Changes | ASU 2014-09
Revenues:
Gross revenues	11,674
Less promotional allowances	(11,819)
Net revenues	(145)
Operating expenses:
Total operating expenses	(145)
ASC 606 Changes | ASU 2014-09 | Casino
Revenues:
Gross revenues	13,761
Operating expenses:
Operating expenses	8,282
ASC 606 Changes | ASU 2014-09 | Food and beverage
Revenues:
Gross revenues	(1,453)
Operating expenses:
Operating expenses	(6,923)
ASC 606 Changes | ASU 2014-09 | Hotel
Revenues:
Gross revenues	(658)
Operating expenses:
Operating expenses	(973)
ASC 606 Changes | ASU 2014-09 | Other
Revenues:
Gross revenues	24
Operating expenses:
Operating expenses	(531)
Pre ASC 606 Adoption | ASU 2014-09
Revenues:
Gross revenues	67,942
Less promotional allowances	(11,819)
Net revenues	56,123
Operating expenses:
Selling, general and administrative	15,185
Depreciation and amortization	3,692
Total operating expenses	47,566
Net income	$ 6,741
Earnings per share of common stock
Basic (in dollars per share)	$ 0.38
Diluted (in dollars per share)	$ 0.36
Pre ASC 606 Adoption | ASU 2014-09 | Casino
Revenues:
Gross revenues	$ 43,706
Operating expenses:
Operating expenses	18,978
Pre ASC 606 Adoption | ASU 2014-09 | Food and beverage
Revenues:
Gross revenues	15,485
Operating expenses:
Operating expenses	6,171
Pre ASC 606 Adoption | ASU 2014-09 | Hotel
Revenues:
Gross revenues	5,705
Operating expenses:
Operating expenses	2,526
Pre ASC 606 Adoption | ASU 2014-09 | Other
Revenues:
Gross revenues	3,046
Operating expenses:
Operating expenses	$ 1,014